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AREX is a Slovenian manufacturer that does not get nearly enough credit, and the Delta X OR Gen 2 is a solid example of why. The X model takes the compact M-size slide and pairs it with the longer full-grip L-frame, giving you that sweet spot of a 4-inch barrel with a grip that comfortably holds 17 or 19 rounds depending on which magazine you drop in. The result is a service-sized pistol that is slim, well-balanced, and at home in a duty holster, on the range, or as a home defense option.
The Gen 2 upgrade brought some meaningful changes over the original Delta. AREX replaced the older checkered grip texture with an aggressive sandpaper-like stippling on all four sides of the grip, which genuinely improves purchase without chewing up your hands. A flared magwell helps with faster reloads, and the frame now includes a multi-slot Picatinny rail for lights and lasers. The slide is machined from nitrocarburized steel with serrations both front and rear, and the optics cut is set up to accept most popular mini red dots using the included five-plate mounting system.
The OR configuration ships with five adapter plates and the hardware needed to mount a wide range of miniature reflex sights. Iron sights are included as well, featuring a white dot front and a black serrated rear, so you have a working setup even before you add glass. The trigger is a short-reset flat-faced design that gets noticeably smoother with use, and the fully ambidextrous magazine release and slide lock make this one of the more left-hand-friendly pistols in this price range.
The modular frame design is worth mentioning too. The front and rear frame inserts are removable and house the slide rails and fire control group, meaning non-serialized components can be swapped out or replaced. It is a thoughtful design choice that gives this platform real longevity. With two magazines in the box and a loaded chamber indicator and striker status indicator built in, the Delta X OR Gen 2 arrives ready for serious use.
The Delta X OR ships with five standardized mounting plates designed to fit most popular mini red dot footprints, including RMR-pattern and other common MRDS designs. AREX provides a compatibility chart to match the correct plate to your optic. The plates use hex screws and a driver is included, making swaps straightforward.
The M is the most compact model, roughly in the Glock 19 size range. The L is the full-size version with a longer slide and grip. The X is a hybrid that uses the shorter M-length slide with the longer L-frame grip, giving you a 4-inch barrel combined with full-capacity magazine compatibility. It is a popular format for people who want a concealable slide profile without sacrificing grip real estate.
Yes, it ships with two magazines: one 17-round and one 19-round. The 19-round mag uses an extended base pad and brings the total capacity to 19+1. Having both in the box is a nice practical touch right out of the gate.
The pistol comes with four interchangeable backstraps of varying sizes. Swapping them is simple: punch out the retaining pin, slide off the installed backstrap, slide on the desired size, and replace the pin. This lets shooters of different hand sizes dial in a fit that feels natural, which is especially useful when more than one person in a household will be shooting the same gun.
The Delta X is dimensionally similar to the Glock 17 and Glock 19X, and several reviewers have confirmed it fits holsters designed for those platforms. That said, holster fit can vary by manufacturer and design, so it is worth confirming with your specific holster maker before relying on it for carry. Dedicated AREX Delta holsters are also available from several major holster brands.
The combination of a full-length grip, 17+1 capacity, optics-ready slide, and fully ambidextrous controls makes the Delta X OR a well-rounded choice for both home defense and duty-style applications. The nitrocarburized steel slide and forged barrel are built for durability, and the platform has proven reliable across a wide variety of 9mm loads in documented testing.
| UPC | 815537023954 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 815537023954 |
| Action | |
| Barrel Length | 4" |
| Caliber/Gauge | 9mm |
| Capacity | 17 + 1 |
| Safety | Firing Pin |
| Shipping Weight | 3.2 |
| Slide Description | Optic Cut/Serrated |
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